package Java.Lock.Count;

//演示   CountDownLatch  减少计数

import java.util.concurrent.CountDownLatch;

public class CountDownLatchDemo {
    //6个同学陆续离开教室之后，班长关门
    public static void main(String[] args) throws InterruptedException {
        //创建CountDownLatch对象，设置初始值
        CountDownLatch countDownLatch = new CountDownLatch(6);

        //6个同学陆续离开教室之后
        for (int i = 1; i <= 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + " 号同学离开了教室");
                //计数  -1
                countDownLatch.countDown();

            }, String.valueOf(i)).start();
        }

        //等待
        countDownLatch.await();
        System.out.println(Thread.currentThread().getName() + " 班长锁门走人了");
    }
}
